//随机显示大banner
(function(){
	var slide=$('#slideBox .J_slide');
	var len=slide.length;
	if(slide.length===1){ return; }
	function randomNum(lower, upper){
		return parseInt(Math.random() * (upper - lower + 1) + lower);
		}
	var ranNum=randomNum(1, len)-1;
	slide.not(slide.eq(ranNum)).remove().find('img').removeAttr('src');
})();
